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Goodwill and Other Intangible Assets (Tables)
 6 Months Ended
Jun. 28, 2020
Goodwill and Other Intangible Assets [Abstract]  
Intangible Assets Subject to Amortization
Intangible assets subject to amortization as of June 28, 2020 and December 31, 2019 were as follows:

        
June 28, 2020
    
December 31, 2019
  
(millions of dollars)
  
Weighted Average
Useful Life
(Years)
    
Gross
Carrying
Amount
    
Accumulated
Amortization
    
Gross
Carrying
Amount
    
Accumulated
Amortization
  
                               
Tradenames
    
35
    
$
203.9
    
$
35.4
    
$
203.9
    
$
32.5
  
Technology
    
13
      
18.8
      
8.8
      
18.8
      
8.0
  
Patents and trademarks
    
19
      
6.4
      
6.0
      
6.4
      
5.9
  
Customer relationships
    
22
      
24.8
      
5.2
      
24.7
      
4.4
  
     
32
    
$
253.9
    
$
55.4
    
$
253.8
    
$
50.8